Just a note, besides polishing the internals, there is no benefit to any other change in the internal parts - NONE. Trust me, all your time is better spent externally as these bad boys run extremely well stock. Lighter bolts mean spring adjustments and timing problems with your feed system and recycle times causing ball breaks in the breach. No good!

Just a note, besides polishing the internals, there is no benefit to any other change in the internal parts - NONE. Trust me, all your time is better spent externally as these bad boys run extremely well stock. Lighter bolts mean spring adjustments and timing problems with your feed system and recycle times causing ball breaks in the breach. No good!

I HIGHLY agree with Tomcat here. I changed everything inside mine and within playing 2 games reverted back to stock. They did a lot of work to find the best combo of weight and fit for the internals, after market stuff will just cause issues. Take if from someone who has already tried it.